change your port to 587, 465 or 485 (either one)

Finally sussed it....
The tip is to disregard the advice given on the "3" website regarding altering smtp port numbers.
These are the settings that work for me on a "3" dongle in the UK as of Dec 20th 2009...

This is for OUTGOING mail ONLY!!

smtp server = smtp-mbb.three.co.uk
Port Number = 25 (default)
No authentication required
No secure connection required

Voila - Bob`s yer lobster

Hope this helps Si

well as long as it works, that's ACE... how did u sus it?

Hi

I made these changes on a PC with the 3 USB modem/ dongle and it worked fine afterwards:

Outgoing smtp:hosts.co.uk + need to tick outgoing authentification (and add username.... and password ............) + under Advanced tab - change port 110 to 587 (or 465)

*****You need to replace 'hosts.co.uk' with the smtp for whichever hosting company you are with.

(Remember to change port 587 back to 110) when going back to normal wifi)
hope this helps
Dave W

I stumbled upon XRaySpex's solution to the outgoing mail problem on 3: put "smtp-mbb.three.co.uk" in the outgoing Mail server address in the e-mail configuration, rather than my own ISP's server name. It worked immediately! This was sort out a temporary issue when I was away from home trying to send e-mails and browse the web from a laptop via a 3 dongle, rather than my copper-wire landline and BT Broadband (which gives me access to my ISP's e-mail POP3 and SMTP servers without problems). I had only previously RECEIVED e-mails and browsed the web on 3, and did not realise the problem until I had need to SEND e-mails from the laptop while away from home.
Thanks again.

Thank you @dangerjunkie.
Your advice worked for me too.
<<<put in smtp-mbb.three.co.uk, then click on the advanced tab, use the default port setting and for authentication use none.>>>

n mail preferences go to the outgoing server and click on the pull down menu and click edit servers. In account information the description can be anything but in the server name put in smtp-mbb.three.co.uk, then click on the advanced tab, use the default port setting and for authentication use none.

Worked for me...thanks

Thank you. Worked for all my emails

BLESS YOU!

After tearing my hair out setting up my Samsung Galaxy S2 and getting useless information from 3 this WORKS!

this works on talktalk using thunderbird also